Auromercaptobenzenes and process of making same.



ADOLF FELD'I, 0F FRANKEORT-OIN-THE-MAIN, AND PAUL FRITZSCHE, 0F HClCHST-ON- THE-MAIN, GEEMANY, AS

SIGNUBS TO r'answnann Vania. MEIS'IEB. LUCIUS & BR'UNING, or HooEsr-on-riin-Mam, GERMANY, a

CORPORATION OF GERMANY.

AUROMERCAPTOBIENZENES AND P3600118?- OF MAKING SAME.

morass.

No Drawing.

To all whom it may concern:

Be it known that we, AnoLr FnLn'r, M. D, and PAUL Fnrrzsonn, Ph. D., chemist, citi- Zens of the Empires of Russia and -Germany, respectively, residing at Frankforton-the-Main and Hiichst-on-the-Main, respectively, Germany, have invented certain new and useful Improvements in Auromercaptob'enzenes and Processes of Making Same, of which the following is a specification.

We have found that auromercaptobeir zones are obtained by causing gold double-halids to act upon mercaptobenzeues. Those of the said auromercaptobenzenes which dissolve in water are products of great therapeutical value.

In order fully we give the following examples Example I.

Pr paration of QFMFOMQWCCZPtObOHZG77.8:- 5.92 grams of potassium aurobromid, dissolved in 100 cc. of methyl alcohol, are gradually added, While stirring, to 4.4: gr. of thiophenol dissolved in 100 cc. of methyl alcohol. The mixture completely decolorizes and separates a precipitate which is filtered off. This precipitate is washed in 500 cc. of alcohol for 5 hours while stirring, isolated by filtration and dried in a vacuum. When finely triturated the aurothiophenol constitutes an insoluble light-yellow powder of a constant composition corresponding to the formula O H SAu, the percentage of gold contained therein being: calculated: 64.38; found=63.95.

E'rmmple 1].

Preparation of the potassium aatt of 2- auromeroaptobcazcne I era 1 x9550 acid.- A solution of 10.5 grams of potassium. auro bromid in 125 cc. of acetic ester are'added b'y drops, while stirring, to 10 gr. of finely-- powdered 2-mercaptobenzene 1 carboxylic acid which has been dissolved, while stirring, in 250 cc. of acetic ester and filtered to a clear solution. After a short time, the mixture becomes gradually decolo-rized and at the same time a brown powdered'product e separates. After having allowed. the lflliib ture to stand for 24; hours the precipitate Specification of Letters Patent.

Application filed October 1 to illustrate our invention more 7, 1916. Serial No. 126,218.

filtered ofi and to the slightly-yellowishbrown filtrate is added one liter of absolute alcohol. A heavy, white-yellow precipitate, namely the 2 auromercaptobenzene l carboxylic acid immediately separates. After hours standing the liquid Which covers the sediment is decanted and the precipitate is filtered ofl? on a hardened filter and finally Washed with alcohol. In a dry state, the product forms a granulated yellowish powder of a constant composition and of the formula:

the percentage of gold contained therein being: calculated 56.23; found 55.71. For preparing the potassium salt, 10. gr. of 2 auroznercaptobenzene 1 carboxylic. acid are dissolved in 4:0 cc. of aqueous caustic soda lye of 4: per cent. strength and to this solution are then added 250 cc. of alcohol. A. white-yellow precipitate separates which is filtered ed and dried in a desiccator.

Example 112'. For obtaining the sodium salt of the 4:-

Patented Dec. 5, 1916. i

amino-2-auromercaptobenzene 1 carboxylic acid we proceed as follows: We prepare: (1) 4-aitr0-2- gr. of 4-nitro-2-amino-l-benzoic acid are dissolved in 2 liters of caustic soda lye of 2 per cent. strength while heating. The-hot solution is then poured, while stirring, into one liter of water cooled with ice and to the mixture are added 71 gr. of sodium nitrate dissolved in concentrated hydrochloric acid. After one hour, the slight residue is filtered off. To this filtrate are added, While stirring, at 15 C. 400 gr. of potassium sulfocyanate dis solved in 2 liters of Water and 10 gr. of coppenbronze. The temperature is kept at 15 C. by adding ice. After two hours, the precipitate is filtered ol f and then dissolved in 2 liters of caustic soda lye of 2 per cent. strength; the copper bronze is removed by filtration and the filtered product is precipitated by means of hydrochloric acid. When dry, the nitro-thiocyanobenzoic acid thus ob tained constitutes a yellowish, crystalline vpowder melting at 161 C. The percenta e of sulfur and nitrogen contained therein 500 cc. of Water and 450 cc. of.

'bowylz'c aeid.-1(3.8 gr. benzene-carboxylic acid. dissolved in 200 cc.

being: calculated: 14.21 and 12.5 respectively;.found:14.29 and 12.77 respectively.

poured into 590 cc. of pure concentrated hy drochloric acid diluted with an equal volume of water. The yellowish residue is collected on the filter and dissolved in 500 cc. of canstic soda lye of 2 per cent. strength. The solution is filtered so as to become clear poured while stirring into stron ly-dilutcd hydrochloric acid prepared from 200 cc. oi concentrated hydrochloric acid in,two liters of water. The whole is allowed to stand over night whereupon the yellow precipitate is filtered oil. The filtrate is neutralized with caustic soda lye when the aminomercaptocarboxylic acid precipitates. By redissolving the same it is purified. When dry, the 4vamino-2-mercaptobenzene-carboxylic acid constitutes a yellowish-white powder,'melting at 216 C. and soluble in alcohol, acetone and strongly-diluted hydrochloric acid.

J;-amino-fi-auromcrcapfi0benzene carof amiimmercaptoof chemically pure caustic soda. lye of l per cent. strength and filtered until clear, are run into 2 liters of diluted hydrochloric acid While stirring and, it required, the mixture is decolorized by means of animal charcoal.

To the filt "ate is added in the courseof 1} hour, while stirring, a solution of 14.8 gr. of potassium auro-bromid in'one liter of Water. The 4:-amino2-auromercaptobenzene carboXylic. acid separates as a yellow precipitate which is at once filtered on a hard ened filter, washed with water until-neutral, then with alcohol and finally again washed with ether. The filter with the precipitate is then dried over sulfuric acid and the acid which agglomeratesto a hard lamp and which, after being completely dry, can be easily separated from the filter, is triturated to a powder of alight-yellow color which is insoluble in the usual solvents.

.(4) The sodium salt of .tnmiow-Q-duroand.

the

mommy)25060122091e-J-carbozvylic (zeal-40 gr.

arates as flakes only after being carefully The and gently heated whi'le stirring. liquid which covers the sediment is carefully decanted, the sodium salt collected on a hardened filter, again well washed with alcohol-in order to coimiiletely dissolve any excess of caustic soda-and finally washed with ether. -'lhc filter with the precipitate is dried over concentrated sulfuric acid; the salt which ar'rglomerates to a lump and which .can. be easily separated from the filter when completely dry, is triturated to a yellow powder and dried in a vacuum at 190 C. until its weight becomes constant. The sodium salt thus obtained is readily soluble in water, insoluble in organic solvents.

Having now described our invention what we claim is:

1. The process of preparing auromercaptobenzenes. which consists in causing gold double-halids to act upon mercaptolwnzenes.

2. As new products, auromercaptobenzenes corresponding to the gene 'al formula:

wherein X stands for any benzene nucleus,

being solid bodies of a yellowish color.

fl. As a new product, the sodium salt of 4-11minofl-auromei'captobenxene-l-can boxylic acid having the formula:

'COONa I 1 NH-- SAu being a yellowish powder, roadily soluble. in water, insoluble'in organic solvents.

In testin'iony whereof, we allix our signatures in presence oi two witnesses.

Du. Mm. ADOLF FELD'I. 'Du. PiuL. PAUL FRITZSCHE.

\Vitnesses:

JEAN (inunn, CARL Gn'nn'ofj j i 

